2398998978 has 64 divisors (see below), whose sum is σ = 5437635840. Its totient is φ = 783820800.

The previous prime is 2398998977. The next prime is 2398999037. The reversal of 2398998978 is 8798998932.

2398998978 is a `hidden beast` number, since 2 + 398 + 99 + 89 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (2398998977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 692226 + ... + 695682.

It is an arithmetic number, because the mean of its divisors is an integer number (84963060).

Almost surely, 2^2398998978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2398998978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2718817920).

2398998978 is an abundant number, since it is smaller than the sum of its proper divisors (3038636862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2398998978 is a wasteful number, since it uses less digits than its factorization.

2398998978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720 (or 3714 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 72.

The square root of 2398998978 is about 48979.5771521151. The cubic root of 2398998978 is about 1338.6797306368.

The spelling of 2398998978 in words is "two billion, three hundred ninety-eight million, nine hundred ninety-eight thousand, nine hundred seventy-eight".